N1K2Ja was installed homare engine.This engine spec is as same as ha-45.Ki-84(hayate) was installed ha-45 engine.But,N1K2Ja and Ki-84 spec is very different.Because the two engines are completely different from the performance.

I think ha-45's performance is true.

I'm not sure I understand what you mean.

The Ha 45 is the same as the NK9, just different names for Army/Navy aircraft.

The engines both made the same power, 1,825 horsepower (often less than that). The reason for different performance was the airframe. Drag, lift, the shape and size of the N1K2J.

Your speed chart is much faster than the aircraft flew in WW2. Maximum speed should be 369mph/594kph or around there. You list 630kph!

N1K2Ja was installed homare engine.This engine spec is as same as ha-45.Ki-84(hayate) was installed ha-45 engine.But,N1K2Ja and Ki-84 spec is very different.Because the two engines are completely different from the performance.

I think ha-45's performance is true.

I'm not sure I understand what you mean.

The Ha 45 is the same as the NK9, just different names for Army/Navy aircraft.

The engines both made the same power, 1,825 horsepower (often less than that). The reason for different performance was the airframe. Drag, lift, the shape and size of the N1K2J.

Your speed chart is much faster than the aircraft flew in WW2. Maximum speed should be 369mph/594kph or around there. You list 630kph!

Was developed concurrently with Kai Shiden fighter expression of four Nakajima Aircraft equipped with the mover as "Gale" (hereinafter abbreviated as against formula IV) and, when compared on the catalog specs a maximum speed of Kai Shiden, streetcar more inferior breaks. Maximum speed of 335 knots during trial breaks Shiden (620.4km / h). Horizontal 348 knots at full speed (644km / h), respectively. 624 ~ 640km / h top speed of the initial prototype four-wire, four-wire prototype that was later converted into a single exhaust pipe further thrust equation, so fast 10 ~ 15km / h from the initial prototype. Dated January 1945, "Pilot Reference Kai Shiden attitude 'as seen from the descriptions of twelve types of honor is a mover and Shiden Kai Shiden about 10% lower than the state rated output limit for driving respectively.----cut-----"The Illustrated Directory of Fighters" (Author Mike Spick) according to P.218, N1K2-J (Kai Shiden) is 19,030 ft (5,800 m) 416 Maximum speed in miles (669km / h), 358 top speed at sea level miles (576km / h), the rate of increase is 20,014 feet (6,100 m) that contains six seconds and a 6-minute performance. Although these figures are covered with figures and comments are based on test data with aircraft that were captured by coalition forces, including more sources of information from which the test is unknown.

N1K2Js in Japanese service made only 370mph (some were much slower, made with poor quality).

From 370mph to 416mph? That's 46mph faster than it could in World War II!

The translation is bad, but I think what you are quoting is a captured US test where they used high-octane gas and cleaned up the airframe for testing. They achieved much faster speeds than the japanese ever could. You can see the same results on several tests of captured japanese craft -- the US often got much better performance out of the aircraft.

This is noticable for captured A6M3 and Ki-84 models as well. It cannot be taken as a real test value because it never flew in combat like that.